Automatic fire-alarm signal system



Oct. 12 1926. 1,603,072

F. F' DENZLER AUTOMATIC FIRE ALARM SIGNAL SYSTEM Filed March 5. 1925 w M ad Patented 0a. 12, 1926.

' UNITED STATES FELIX I. DENZLER, OF BOMONA, CALIFORNIA.

AUTOMATIC FIRE-ALARM SIGNAL SYS'IIEflliII."

Application flled'lllarch 5, 1925. Serial No. 13,254.

This invention relates to improvements in automatic fire alarm signal systems being more particularly a thermostatically controlled fire alarm system designed for use in connection with the common form of telephone systems now in use 'throughout the country in both cities and rural districts.

One of the objects of-the invention is the provision of an automatic fire alarm system which is capable-of connection to an ordinary telephone system fwithout affecting or lessening the utility of the telephone system.

Another object of the invention is the provision of an automatically controlled fire alarm system which is connected to and as sociated with the ordinary telephone system and which derives the current for transmitting the alarm from thetelephone system.

Another andffurther object of the invention is the provision of a thermostatically controlled telephne system in combination with the ordinary telephone system which telephones rather than telegraphs the alarm.

A still further object of the invention is the provision of an automatic fire alarm system of the character described having a novel wiring circuit, a novel form of thermostat and electromagnet control and which embodies other novel features of construction which will be hereinafter more specifically described. 1

' A still further object of the invention is the provision of an automatic fire alarm signal' system having a simple wiring circuit and which is capable of attachment and association with the common form of telephone Other novel features of construction, improved results and advantages of the invention appear in the following description and from the accompanying drawings.

In the drawings:

Figure '1 is a perspective diagrammatic view of the invention. a

Fig. 2; is a top plan of thebuzzer, trans- 'mitter and thermostat.

Fig. 3 is a detail view of the electromagnet and the clock workin mechanism.

Referring now to t e drawings in which like parts. are designated by similar reference numerals throughout the description, A represents the ordinary form of telephone in common use and B and C designate telephone wires leading from the telephone instrument to the main line (not shown) which eventually reach the telephone central ofiice or station (not shown). As is common in respect to telephone systems the telephone station is signalled when the telephone receiver D is lifted from its hook which brings about the closing of the telephone circuit.

My improved fire alarm signal system comprises an entirety in itself and is capable of being connected to the telephone trally provided with an upwardly extending shaft or rod 9 which projects upwardly beyond the base 5.

At one end of the base 5 there is provided a suitable standard or bracket 10 carrying switch members ll'and 12 suitably insulated from one another by means of the insulation 13. At the opposite side of the rod 9 there is provided a suitable support or bracket 14 to which is pivotally supported a forked lever 15. The forked portion 16 of this lever engages an adjustment screw 17'carried uponthe upper screw-threaded end 18 of the rod 9.

The upper switch member 11 is provided 1 with a forked end 19 which is adapted to engage the end 11 of the forked rod 15 as clearly appears in Fig. 1 of the drawings.

The opposing faces of the switch members 11 and 12 are provided with suitable contact points 20 and 21'which are composed of a I suitable non-corrosive metal,

There is also mounted upon the base 5 a transmitter 22'upon which is superimposed a buzzer or signal member 23. In connection with my $1 its wound condition through the medium gnal system I also use a clock mechanism whlch is mounted pf a pawl 31 which engages the gear 32.

E as at 50.

5 visible.

The clock mechanism is provided with an escapement 33 which is pivotally mounted as at 34 and provided with an outwardly extending rod portion 35.

Associated with the clock mechanism there is an electric magnet F which is provided, as is common, with a core 36. This magnet is provided with a bracket 37 which pivota-lly supports as at 38 a depending arm 39 in front of the core 36 and adapted to be actuated thereby. The arm 3.9 is further provided with an extending rod 40 the end of which is positioned to normally engage the escapement rod 35,- as appears at 41 and thereby prevent the operation of the escapement. To assure the normal engagement between these members I provide a suitable spring 42 which has its one end attached to the pivoted arm 39 while its other end is attached to the frame E.

The gear 28 of the clock mechanism is provided with a series of upstanding lugs or dogs 42, 43, 44 and 45 which are adapted, upon occasion, to engage the end of the downwardly extending contact spring member 46 which issuitably attached to and in-' sulated from the frame E as appears at 47.

Referring to the wiring of the signal device and its connection with the telephone system it will be seen that a leadotf wire 48 from the telephone wire Cl is connected to the upper switch member 11. A connecting wire 49 is provided between the lower switch member 12 and runs to and is grounded upon the frame Another lead-off is taken from the telephone wire B and comprises a wire 51 which is connected to the trans mitter as at 52 and from the transmitter to the buzzer as at 53. Passing through the buzzer this wire leaves the buzzer terminal 54 and runs to the transmitter terminal 55 and from there is wired as at 56 to the spring switch member 46. Electrical con-' nection for the magnet F is provided through the medium of a lead-ofi wire 57 from the wire 49 and the wire 58 from the wire 51.

In installing the signal system in a building the parts will be practically hidden from sight. Preferably the plate 5 will be fitted against the ceiling or wall of a room so that the thermostatic members-'6 and 7 and their connecting bar 8 will be the only parts The clock mechanism and the electromagnet can be installed in any suitable and convenient place.

Preferably the device will be so adjusted that at 115 F. the thermostatic members 6 and 7 will act upon the bar 8 and rod 9 to draw the pivoted forked member 15 downwardly and thereby cause contact between the contact points 20 and 21 of the switch members 11 and 12. It will be understood however that through the medium of the adjustable member 17 that the contact between the switch members 11 and 12 can be so adjusted as to occur at any desired temperature.

Operation.

If from the foregoing description the. operation of the device has not been understood it will be seen that when the temperature reaches a suflicient degree to bring about the contact of the switch members 11 and 12 by reason of the action of the thermostat that electric current from the telephone wire C will pass through the wire 48, the switch members 11 and 12 and into the wire 49 and thence to the frame E. Electric current is constantly in the wire 51 which has connection with the telephone wire B.

It will now be seen that by reason of the connection of the wires 57 and 58 to the electric magnet the core 36 of the magnet wi l be energized and will draw the pivoted arm 39 and its extending shaft 40 out of engagement with the escape rod 35.

Immediately this takes place the escapement begins to operate and the gear 28 rotates. The rotation of the gear 28 brings the contact lugs or dogs 42 to 45 inclusive into periodic engagement with the depending spring switch member 46. Immediately this takes place the circuit is completed between the ground on the frame E through the switch member 46, wire 56, transmitter and buzzer. Y

It will now be seen that the buzzer will transmit through the transmitter 22 which is connected to telephone wires B and C to the central telephone office or station.

As has been previously described, when the circuit is closed between the telephone wires B and C the central office is signalled. Immediately the switch members 11 and 12 contact the central telephone office is signailed because the circuit between the telephone wires is closed between the electromagnet and the wire 58 which is connected to the wire 51.

From this it will be seen that prior to the buzzing of the signal the telephone operator has been signalled that a call is coming in and will therefore receive the buzzes as they periodically take place. It will be readily apparent that the lugs or dogs 42 to 45 inclusive can be so arranged and shaped as to bring about different lengths and different numbers of buzzes. It only remains for each alarm apparatus to be listed at the telephone exchange so that the o erator when she receives the alarm can notify the fire department,

From the foregoing it will be seen that I have provided an automatic fire alarm sys telephone operator at the telephone headquarters. by the use of my system any number of alarms can be attached to a city or rural te1ephone systeinzand thereby afi'ord fire pro tection to a community. This can be brought about of course without impairing the use of the telephone system.

Iwish it also to be understood that de partures can be made in respect to the invention and its specific parts without departing from the spirit of the invention as heretofore described and as will be hereinafter claimed.

Having thus described my invention,

- what I claim and desire to secure by Let ters Patent is:

1. A fire-alarm system including an open telephone. circuit, an open second circuit electrically connected with the telephone circuit, a transmitter, an alarm and a ther- It will be readily apparent that mo-responsive device, the three latter being includedin said second circuit, the thermo device adapted to close both said circuits, the alarm operating after the said transmitterwhereby the transmitter first indicates a signal at the central station, after which the alarm is then transmitted to the said central station. v

2. A fire-alarm system comprising an open telephone circuit, an open second circuit cone nected with the said telephone circuit, an

, signature.

' FELIX F. DENZLER. 

